unchristen

From un- +‎ christen.

unchristen (third-person singular simple present unchristens, present participle unchristening, simple past and past participle unchristened)

1. (transitive) To render unchristian.
   • 1643, J[ohn] M[ilton], The Doctrine and Discipline of Divorce: […], London: […] T[homas] P[aine] and M[atthew] S[immons] […], →OCLC:

     to constrain him furder were to unchristen him , to unman him , to throw the mountain of Sinai upon him

2. To undo the act of christening.

• “unchristen”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.